# ButtonToggle

## `ButtonToggle` (FB)

FUNCTION\_BLOCK ButtonToggle

### Short description

> Switching element with button and central control.\
> Typical application: light pushbutton and light output.

### Representation

<figure><img src="/files/0a5d95ae746e671b7892c60da011400077b01b1e" alt=""><figcaption></figcaption></figure>

### Interfaces

#### Inputs

| Name          | Data type | Value range | Initial value | Function                 |
| ------------- | --------- | ----------- | ------------- | ------------------------ |
| *xButton*     | BOOL      |             |               | Input - operating button |
| *xCentralOn*  | BOOL      |             |               | Central switch-on        |
| *xCentralOff* | BOOL      |             |               | Central switch-off       |

#### Outputs

| Name   | Data type | Value range | Initial value | Function        |
| ------ | --------- | ----------- | ------------- | --------------- |
| *xOut* | BOOL      |             |               | Enable - output |

#### Setpoints / Parameters

| Name            | Data type | Value range | Initial value | Function              |
| --------------- | --------- | ----------- | ------------- | --------------------- |
| **xButtonVisu** | BOOL      |             | FALSE         | Function as *xButton* |

### Function description

#### General

The function block is generally used for direct control of the enable - output *xOut* depending on the rising edges at the inputs *xButton* (= operating button), *xCentralOn* (= central switch-on), *xCentralOff* (= central switch-off) and the setpoint / parameter **xButtonVisu**.\
Every rising edge at the input - operating button *xButton* and / or at the setpoint / parameter **xButtonVisu** switches the output *xOut* to the opposite state, provided no central control is taking place.\
If no rising edges are detected, the state of the enable - output *xOut* does not change.

#### Function table

| *xButton* or **xButtonVisu** | *xCentralOn*     | *xCentralOff*    | *xOut*                     | Note                                  |
| ---------------------------- | ---------------- | ---------------- | -------------------------- | ------------------------------------- |
| FALSE, TRUE, H/L             | FALSE, TRUE, H/L | FALSE, TRUE, H/L | unchanged                  | Inputs not active                     |
| L/H                          | FALSE, TRUE, H/L | FALSE, TRUE, H/L | FALSE > TRUE, TRUE > FALSE | State change at the output            |
| FALSE, TRUE, H/L             | L/H              | FALSE, TRUE, H/L | TRUE                       | Central switch-on                     |
| FALSE, TRUE, H/L             | FALSE, TRUE, H/L | L/H              | FALSE                      | Central switch-off                    |
| L/H                          | L/H              | FALSE, TRUE, H/L | TRUE                       | Central switch-on (higher priority)   |
| L/H                          | L/H              | L/H              | FALSE                      | Central switch-off (highest priority) |

Legend: L/H … rising edge, H/L … falling edge

### CODESYS

InOut:

| Scope       | Name          | Type   | Initial |
| ----------- | ------------- | ------ | ------- |
| Input       | `xButton`     | `BOOL` |         |
| Input       | `xCentralOn`  | `BOOL` |         |
| Input       | `xCentralOff` | `BOOL` |         |
| Input Const | `xButtonVisu` | `BOOL` | FALSE   |
| Output      | `xOut`        | `BOOL` |         |


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